.app-advert {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.app-advert .title {
  height: 44px;
  text-align: center;
  line-height: 44px;
}
.app-advert .main {
  flex: 1;
  background: url('../imgs/advertisement-bg.jpg') no-repeat center;
  background-size: cover;
  position: relative;
}
.app-advert .main .text {
  width: 100%;
  text-transform: uppercase;
  /* 转为大写 */
  font-size: 48px;
  color: #fff;
  font-weight: bold;
  text-align: center;
  position: absolute;
  bottom: 150px;
  animation: move 3s ease-in-out forwards;
}
.app-advert .main .countdown {
  width: 105px;
  height: 40px;
  background-color: #fff;
  border-radius: 20px;
  position: absolute;
  right: 14px;
  top: 28px;
  line-height: 40px;
  text-align: center;
}
@keyframes move {
  0% {
    font-size: 0;
    opacity: 0;
  }
  35% {
    font-size: 20px;
    opacity: 0.3;
    bottom: 200px;
  }
  75% {
    font-size: 48px;
    opacity: 1;
    bottom: 60px;
  }
  100% {
    font-size: 48px;
    opacity: 1;
    bottom: 60px;
  }
}
